For months now the late night host has been trying to persuade Mitt Romney to come on The Late Show With David Letterman with no success. “They don’t return our calls,” said David Letterman in his monologue last night. Dave has even been urging viewers not to vote for Romney if he won’t be a guest. But on the eve of the first Presidential debate Romney did show up – or at least Jack Black impersonating the Republican candidate. Here’s the interview: